C++ PATCH for c++/53995 (wrong name lookup with enum in member function)

[Jason Merrill]

Checking current_class_type isn't enough to determine whether we're at 
class scope; in this testcase it's set, but current_scope() is the 
member function, so we don't want to mess with the type.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.7.
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